//Released under the MIT License.
//
//Copyright (c) 2015 Ntreev Soft co., Ltd.
//
//Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated 
//documentation files (the "Software"), to deal in the Software without restriction, including without limitation the 
//rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit 
//persons to whom the Software is furnished to do so, subject to the following conditions:
//
//The above copyright notice and this permission notice shall be included in all copies or substantial portions of the 
//Software.
//
//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
//WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR 
//COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
//OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Ntreev.Library.Psd.Readers.LayerAndMaskInformation
{
    class LinkedDocumnetFileHeaderBlock : LazyDataReader
  {
        public LinkedDocumnetFileHeaderBlock(PsdReader reader, long length)
            : base(reader, length, null)
        {
        }

    private FileHeaderSection fileHeaderSection;

    public FileHeaderSection FileHeaderSection
    {
      get
      {
        ReadData();
        return fileHeaderSection;
      }

      set
      {
        fileHeaderSection = value;
      }
    }

    protected override void ReadData(PsdReader reader, object userData)
        {
            if (this.IsDocument(reader) == true)
            {
                using (Stream stream = new RangeStream(reader.Stream, reader.Position, this.Length))
                using (PsdReader reader2 = new PsdReader(stream, reader.Resolver, reader.Uri))
                {
                    reader.ReadDocumentHeader();
                  fileHeaderSection = FileHeaderSection.Read(reader2);
                }
            }
            else
            {
              fileHeaderSection = new FileHeaderSection();
            }
        }

        private bool IsDocument(PsdReader reader)
        {
            long position = reader.Position;
            try
            {
                return reader.ReadType() == "8BPS";
            }
            finally
            {
                reader.Position = position;
            }
        }
    }
}
